Mastering Ratios and Proportions in Pharmacy Calculations

Amanda, a pharmacist, explains ratios and proportions, focusing on their definitions, examples, and applications in pharmacy calculations. She demonstrates how to solve ratio and proportion problems using cross-multiplication and provides examples involving dextrose and sodium chloride solutions. The video concludes with a summary of key points and a call to action for viewers to like, share, and subscribe.

What is a ratio primarily used to indicate?

• The difference between two numbers

• The sum of two numbers

• The comparison of sizes between numbers

• The product of two numbers

Which two forms can a ratio be expressed in?

• Fraction and colon notation

• Multiplication and division

• Addition and subtraction

• Percentage and decimal

What does a proportion relate?

• Two unrelated numbers

• Two equal ratios

• Two different measurements

• Two unequal ratios

In the example given, if 5 grams of dextrose are in 100 mL of water, how much would be in 200 mL?

• 5 grams

• 10 grams

• 15 grams

• 20 grams

What is the common variable symbol used in proportion calculations?

• n

• x

• v

• z

What are the basic steps to solve a proportion calculation?

• Add, subtract, and multiply

• Cross multiply, add, and divide

• Divide, multiply, and subtract

• Set up, cross multiply, and divide

How many grams of dextrose are in 25 mL of solution if 100 mL contains 5 grams?

• 1.25 grams

• 10 grams

• 5 grams

• 2.5 grams

What is the concentration of sodium chloride in 50 mL if 1 liter contains 9 grams?

• 9 grams

• 0.9 grams

• 0.45 grams

• 4.5 grams

What does a ratio typically represent in pharmacy?

• Comparison of component sizes

• Volume of a solution

• Weight of a compound

• Temperature stability

Why are proportions important in pharmacy calculations?

• They determine chemical stability

• They help calculate unknown quantities

• They measure temperature variations

• They check the purity of compounds